octa-


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octa-

(word root) eight
Examples of words with the root octa-: octagon
Abused, Confused, & Misused Words by Mary Embree Copyright © 2007, 2013 by Mary Embree

oct-

or octa-
pref.
Variants of octo-.

octo-

or octa- or oct-
pref.
Eight: octane.

[Greek okta-, oktō- (from oktō) and Latin octō- (from octō); see oktō(u) in Indo-European roots.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

octa-

combining form
a variant of octo-
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

octa-

a combining form meaning “eight”: octagon; octahedron.
Also, octo-;esp. before a vowel, oct-.
[< Greek, comb. form of oktṓ eight]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
Because an EU toxicity review of octa- and deca-PBDEs--forms containing eight or 10 bromine atoms--hasn't been completed, at least some EU members may resist extending a ban to those compounds.